Omni-directional planar antenna

Abstract

Provided is a planar antenna having omni-directional radiation patterns. The planar antenna includes a circular patch located on one dielectric substrate of the plurality of dielectric substrates; a planar transmission line applied with signals from the exterior; a signal via for coupling the circular patch with the planar transmission line and supplying the signals incoming through the planar transmission line to the circular patch; and a metal ground plane having a slot having a certain shape through which the signal via passes, and located on the dielectric substrate.

1 . A planar antenna having omni-directional radiation patterns, where the planar antenna is formed by laminating a plurality of dielectric substrates, comprising:
 a circular patch located on one dielectric substrate of the plurality of dielectric substrates;   a planar transmission line applied with signals from the exterior;   a signal via for connecting the circular patch with the planar transmission line and supplying the signals incoming through the planar transmission line to the circular patch; and   a metal ground plane having a slot having a certain shape through which the signal via passes, and located on the dielectric substrate.   
   
   
       2 . The planar antenna of  claim 1 , further comprising:
 a parasitic circular patch having an identical center to the circular patch and located on the dielectric substrate spaced apart at a predetermined distance.   
   
   
       3 . The planar antenna of  claim 2 , further comprising:
 one or more ring resonator located on the dielectric substrate and around the circular patch and the parasitic circular patch; and   a plurality of ground vias for connecting the ring resonator and the metal ground plane.   
   
   
       4 . The planar antenna of  claim 2 , further comprising:
 one or more ring resonator located on the dielectric substrate and around the circular patch and the parasitic circular patch; and   a metal conductor having a predetermined thickness in order to connect the ring resonator and the metal ground plane.   
   
   
       5 . The planar antenna of  claim 2 , wherein a radius of the circular patch is larger than that of the parasitic circular patch. 
   
   
       6 . The planar antenna of  claim 3 , wherein the ring resonator is formed in a ring shape with two rings having radiuses larger than radiuses of the circular patch and the parasitic circular patch. 
   
   
       7 . The planar antenna of  claim 1 , wherein the planar transmission line is one of a micro-strip transmission line, a strip transmission line, a Co-Planar Waveguide (CPW), and a Grounded Co-Planar Waveguide (GCPW). 
   
   
       8 . The planar antenna of  claim 1 , wherein the metal ground plane is implemented with a structure which is entirely formed with metal. 
   
   
       9 . The planar antenna of  claim 1 , wherein the metal ground plane is implemented with a structure which is partially formed with metal.